L64724 LSI Logic Corporation, L64724 Datasheet - Page 165

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

Figure 6.11
decoder determines synchronization, tracking, and loss of
synchronization in the Reed-Solomon synchronization stage.
Figure 6.11 Synchronization, Tracking, and Loss of Sync for Three
The parameters in
Parameter
MC
MSC
Pa, Pt
Reed-Solomon Deinterleaver Synchronization
Pa: State Transition, Sync word detected
Qa: State Transition, Sync word misdetected
Pt: State Transition, Sync word detected
Qt: State Transition, Sync word not detected
Qa
MC
= 0
Synchronization State: (SSA = 0b00)
Pa
Acquisition Phase
shows an example state diagram that outlines how the
Qa
Description
Match counter—number of sync word matches found so far during
the acquisition phase
Mismatch counter—number of sync word mismatches found so far
during the tracking phase
Pa and Pt are functions of L, which is defined as the maximum
number of mismatching bits allowed to declare a match when
comparing M bits in the data stream to the reference sync word
during tracking phase (L = 0, 1, or 2).
Missed Sync Words
MC
= 1
Figure 6.11
Pa
Qa
MC
= 2
are defined as follows:
Pa
MSC = 0
Synchronization State (SST = 0b01)
Pt
MC = 3
Reacquire Sync
Qt
Pt
Tracking Phase
Qt
MSC
= 1
Pt
Qt
Loss of Sync
MSC
= 2
6-9